Get Mozilla Plugin Path

Author: Zunk (talk, contrib)

How To Use

Input:	None
Output:	String to the plugin dir, or empty

This is a macro that looks through the HKLM\SOFTWARE\Mozilla registry to find the first entry with information on the plugin dir and put it on the top of the stack.

The Macro

Save as mozillaplugin.nsh in NSIS\Include.

!macro MozillaPluginDir
 
  Push $R0
  Push $R1
  Push $R2
 
  !define Index 'Line${__LINE__}'
  StrCpy $R1 "0"
 
  "${Index}-Loop:"
 
  ; Check for Key
  EnumRegKey $R0 HKLM "SOFTWARE\Mozilla" "$R1"
  StrCmp $R0 "" "${Index}-End"
  IntOp $R1 $R1 + 1
  ReadRegStr $R2 HKLM "SOFTWARE\Mozilla\$R0\Extensions" "Plugins"
  StrCmp $R2 "" "${Index}-Loop" "${Index}-End"
 
  "${Index}-End:"
 
  !undef Index
 
  Push $R2
  Exch 3
  Pop $R2
  Pop $R1
  Pop $R0
 
!macroend

Example of usage

!include "mozillaplugin.nsh"
 
Section ""
  !insertmacro MozillaPluginDir
  Pop $R0
  MessageBox MB_OK "$R0"
SectionEnd

Got started with help from the page "Check for a Registry Key" by Vytautas.